Saw-sharpening machine.



No. 755,319; PATENTED MAR; z2, 1904.;

' H. P. soHoPIBLD.

SAW SHARPBNING MACHINE.

LPPLIUATIOK FILED HAY 29, 1903. v I0 VMQDEL. 2 SHEETS-SHEET 1.

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No. 755,.319. y 'PATLNTBDMAR..22,1904.-

l H. P; SGHOFIBLD. SAW SHARPBNING MACHINE.

APPLICATION FILED HAY 29, 190'3. N0 MODEL. y l2.SHIIHTS--SHEIET 2.

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mlln, limmiil'nn NN Il uni' sharpening machines of the type illustrated in UNITED STATES -Patented. March 22, 1904.l

PATENT QEEICE.

, HENRY EfSCHOEIELu OE CHICAGO, ILLINOIS ASSRTO COvEL A,

MANUFACTURING COMPANY, or CHICAGO, ILLINOIS, 'iAfCoEPOEA- TION OE ILLINOIS; Y

SAW-SHARPENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 755,319, dated March 22,- 1904.

l Application iiled May 29, 1903. v'Serial No. 159,258. (No model.) Y

To @ZZ whom t mywncern:

Be it known that I, HENRY R'SCHOEIELD, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Saw-Sharpening Machines, ofv which .the following is a specification. My invention relates 4particularljr to sawreissue patent to Filstrup, No. 11,733, granted April 11, 1899, and my Patent No. 654,844, granted July 31, 1900.

My primary object is to provide improved mechanism for actuating the grinding-wheel gate in a machine of this character. y A A further object is to provide improved vvmeans for adjusting the feed-finger-carrying arm of such a machine.

The invent1on 1s IllustratedA 1n the accom- .panying drawings, in which- Figure 1 shows a front view of a saw-sharpening machine equipped with my improvements; Fig. 2, an enlarged broken view of the upper portion of thelever or. arm which actuatesthe feed-fnger-carrying arm; Fig. 3,

a plan section taken as indicated at line 3 of- Fig. 2; Fig. 4, a broken side elevational ViewV ofthe front portion-of the machine; Fig. 5, a section taken parallel with the front of the` cated at line 6 of Fig. 4, and showing a detail of the adjustable rack-equipped stop-bar em- .ployed.

A description of the preferred construction follows: A represents a frame of the usual general construction; B, the usual saw-guide at the front end of the frame; C,V the usual grinding-wheel gate, movable in a guide C and having journaled in it the arbor of the grinding-wheel C2; C2, a connecting-rod connected with the grinding-wheel gate or slideV in the usualmanner; D, the usual longitudinally-extending shaft, equipped with cams D D2 for actuating the grinding-wheel gate and the saw-feeding mechanism, respectively; E, a now well-known rock-lever bearing a novelly adjustable pivoted feed-arm E', equipped with a feed-finger E2; E3, a connecting-rod joining the lever E to a lever E2, actuated by the cam D2; F, a rock-arm having a pivot F', adjustablel in a novel manner in a curved slot F2 with which the frame-front is provided below the plane of the shaft D and near the opposite side of the frame; F2, a roller with which the arm F is equipped and which rides upon the cam D'; F4, a projection or eXten- 'sion of the arm F2 beyond its roller, which is provided with a slot F5, with which the lower end of the connecting-,rod C3 is adjustably connected to enable it to be alined with the Aofthe adjustable arm F7; F10, guide-clips secured to the inner surfaces of the lower and l.

intermediate cross members of the frame-front and having tongues fitting vin the groove t of thebar F2, andv F11 a bell-crank'lever Sup- Vvported on a pivotb atthe intermediate member of one sideframe of the machine and having a forwardly-turned arm equipped with a toothed segment b', meshing with the teeth a and having also an upwardly-turned arm terminating in a handle b2.

The frame A is substantially of the usual form, except that it has cast integrally with its front side the'curved. part provided with the slot F2. The Slot F2 is struck on a radius y from a point c, which should be'the point of contact between the roller F3 and the cam. D and directly above the shaft D, assuming the rock-arm to be in its depressed position. This permits the lower end of the arm F to be swung about the point c in adjustment, so that when the arm F7 isadjusted to change the lower limit of the arc in which the point of connection d between the rod C3 and eXten- 35 'thy that the enumerated advantages may be sion F4 oscillates the pivotal point Fl may be correspondingly varied, if desired, to prevent y decreasing the size of said are. This aids in adjusting the movements of the grindingwheel to saws having teeth of the same height Ibut of different inclination, it being understood that the vertical component of the throw ofthe grinding-wheel gate may be kept a constant by increasing the length of the actuating-arm (at the pivot d) as the inclination of thev guides of the gate is decreased toward ay the grinding-wheel gate, which is obviouslyv the best arrangement for the transmission of power. Furthermore, it is obvious that the new adjustment permits the necessary throw to be obtained without unduly lengthening the arm F. Such lengthening of said arm would be objectionable for the reasons, rst, that the limits of the frame of the machine prohibit too long an arm; second, that any imperfections at the cam are multiplied at the eXtremity of the arm; third, that the `vibration increases with the length, and, fourth, that the 4 connecting-rod would be thrown seriously out of parallel with the grinding wheel gate. Finally, the new adjustment enables a rounder cam to be employed than has heretofore been possible, which is an object of a considerable importance. In this connection it may be stated that a rounder cam than the one shown may ordinarily be employed. It is noteworobtained, in a lesser degree, perhaps, by providing othel` means for adjustment at the pivot than the particular curved slot and connection shown. It may be'added that the relative adjustment of the member F7 and the pivot F may be varied and the location and size of the arc mentioned varied at will, affecting the movements of the grinding-wheel correspondingly. The pivotal connection at F is, of course, of such a nature as to permit secure connection between the pivot and slot without interfering with the free oscillation of the arm F. The arm F7 has bolt connection with the base of the arm F'3 at a point f, so that the joint may be of any desired stifness. The setscrew has screw connection withalateral projection at the extremity of the arm FG, and its point bears upon the arm F7. The lever F11 works in a slot It, which is provided with a shoulder L', with which the lever-may be thrown into engagement when the grindingwheel is raised clear from the saw.

Figs. 2 and 3 show in detail the connection between the feed-arm E' and its actuatingarm E. 'Ihe primary object of this feature is to change the adjustment from the feedarm itself, as illustrated in Figs. 4 and 5 of my above-mentioned patent, to the upper end of the actuating-arm E. In other words, the

pivot of the feed-arm is to be adjusted on the actuating-arm instead of the feed-arm being adjustable on its pivot, thus permitting adjustment during operation without danger of tilting the feed-arm and disengaging the feediinger from the saw. Other advantages will be apparent also. In the improved constructionthe upper end of the lever or actuatingarm E is provided with a hollow rectangular head g, having a guide g/, in which is an adjustable block g2. The block g2 has one side equipped with an integrally-formed plate g, which bears against one face of the head g. rIhe vfeed-arm is carried by a pivotal bolt g4 and has a disk g5, which forms a plate bearing against the adjacent face of the head g. The bolt g4 secures the feed-arm to the block g2. A. longitudinally immovable screw g, provided with a knob g?, serves to adjust the block g2 with relation to the -head g of the actuating-lever.l

The guide C' is of adjustable inclination in the usual manner, being pivotally supported at a and equipped with a curved arm n', having bolt-and-slot connection at its lower end,

as indicated in dotted lines in Fig. 1, with a curved stationary support n2 on the frame. Such a construction is illustrated, for instance, in Fig. 2 of my Patent No. 654,844.

It will be understood that changes in details of construction are contemplated. Hence no undue limitation should be understood from the foregoing detailed description.

What I regard as new, and desire to secure by Letters Patent, is

1. In a saw-sharpening machine, the combination with the grinding-wheel gate of adjustable inclination and shaft for actuating the same, of a rock-arm connected with said gate, and a pivot for said rock-arm adjustable with relation to said shaft in such mannerthat said rock-arm may be maintained substantially perpendicular to the connecting-rod of the grinding-wheel gate, for the purpose set forth.

2. In a saw-sharpening machine, the combination with the grinding-wheel gate of adjustable inclination and the shaft for actuating the same, of a rock-arm connected with said gate, a stationary part having a curved slot struck on a radius about a point near said shaft, and a pivot for said rock-arm adjustably secured in said slot, for the purpose set forth.

3. In a saw-sharpening machine, the combination with the grinding-wheel gate of adjustable inclination and the cam of the actuatingshaft therefor, of a rock-arm connected with said gate and having a bearing on said cam, a frame portion having a slot struck on a radius from substantially the point of contact between said cam and arm in the depressed position of said arm, and a pivot adjustably secured in said slot, for the purpose set forth.

4. In a saw-sharpening machine, the combination with the grinding-wheel gate and the cam of the actuating-shaft therefor, of a rock- IUO IIO

arm connected with said gate and having a pivot at one side of said cam, a rack-equipped vertically-movable stop-bar, and an adjusting-lever equipped with a toothed sector meshing with the rack of said bar, for the purpose set forth.

' pendicular to the connecting-rod, and an adjustable stop for the other end thereof, for the purpose set forth.

6. In a saw-sharpening machine, the combination With the grinding-Wheel gate, its connecting-rod and an actuating-cam, of a rockarm bearing upon said cam, and having an extension adjustably joined to said connectingrod, a'stop-arm pivotally joined to said rockarm adjacent to said extension, means for adjusting the stop-arm With relation to the rockarm, and a stop carried by the frame Jfor engaging said stop-arm, for the purpose set forth.

7. Ina saw-sharpening machine, thecombination with the gate-actuating rock-arm, of a vertically-movable rack-equipped stop-bar,

and an adjusting-lever having a toothedsector engaging the rack of said bar, for the purpose set forth.

HENRY P. SCHOFIELD.

In presence of- W.`B. DAvIEs, WALTER N. WINBERG. 

